a(n) = n! * Sum_{k=0..floor(n/3)} (k/6)^k / (k! * (n-3*k)!).
A362351
a(n) = n! * Sum_{k=0..floor(n/3)} (k/6)^k / (k! * (n-3*k)!).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =11a(6) =61a(7) =316a(8) =1177a(9) =11005a(10) =84121a(11) =434446a(12) =5642781a(13) =56725527a(14) =374014005a(15) =6211205456a(16) =77331975281a(17) =620174850521
External references
- oeis: A362351